Emerson EV3200 User Manual page 56

52 Appendix 2 Modbus Communication Protocol
The table below shows the reply frame from Inverter No.1.
Address Function parameter
0x01
ASCII mode
In ASCII mode, the frame head is "0x3A", and default frame tail is "0x0D" or "0x0A". The frame tail can also be configured by
users. Except frame head and tail, other bytes will be sent as two ASCII characters, first sending higher nibble and then lower
nibble. The data have 7 bits. "A" ~ "F" corresponds to the ASCII code of respective capital letter. LRC check is used, the check
covers the information from slave address to data.
The following example shows the command frame of writing "1000 (0x3E8)" into Register 003 of Inverter No. 1.
Frame head
Code :
ASCII 3A
Protocol function
The main function of Modbus is to read and write parameters. Different function parameters decide different operation
requests. The Modbus protocol supports the following function codes:
Function parameter
0x03 Read inverter's parameter and operation status parameters
0x06 Modify single inverter's parameter or control parameters. Not save them upon power-off
0x41 Modify single inverter's parameter or control parameters. Saving them upon power-off
0x10 Modify several inverters' parameter or control parameters. Not save them upon power-off
All inverter's parameters, control and status parameters are mapped to Modbus R/W Register. The R/W properties of the
parameters and their setting ranges are specified in the user manual. The group number of the inverter's parameter maps to
the most significant byte of the register address, and the index number of the parameter in the group maps to the least
significant byte. The control and status parameters of the inverter are virtually taken as parameter group. The relationship of
group number of the parameters and the most significant byte of register address is listed below:
F0 group: 0x00. F1 group: 0x01. F2 group: 0x02.
F3 group: 0x03. F4 group: 0x04. F5 group: 0x05.
F6 group: 0x06. F7 group: 0x07. F8 group: 0x08.
F9 group: 0x09. FE group: 0x0E.
For example, the register address of F3.02: 0x302, register address of FE.01: 0xE01.
Inverter status parameter group: 0x33. Index of inverter status parameters:
Register address
0x3300
0x3301
0x3302
0x3303
0x3304
0x3305
0x3306
0x3307
0x3308
0x3309
0x3310
0x03
Address Function parameter
0 1 0
30 31 30
Operation status
Running frequency
Output current
Output voltage
Frequency setting
DC bus voltage
Software version
Product configuration
Angle of synchronous machine
Reserved
Input terminal group status (0: OFF 1: ON), X1 ~ X5, OD, CD corresponding to bits 0 ~ 6 respectively
EV3200 Door Control Inverter User Manual
Reply bytes
0x02
Register address
6 0 0 0 2
36 30 30 30 33
Description
Parameter
Register content
0x00 0x00
Content written Check sum
0 F A 0 4
30 33 45 38 30
Check sum
0xB8 0x44
Frame tail
8 CR LF
42 0D 0A